Effect of Tangential Force on the Rolling Contact Fatigue of 0.45 mass%C Steel

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  • 0.45 mass%C鋼のころがり接触疲れにおよぼす接線力の影響
  • 0.45 massパーセント C コウ ノ コロガリ セッショク ツカレ ニ

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Rolling contact fatigue of cylindrical carbon steel test pieces was studied in the presence of a tangential force. The test was carried out under the conditions in which the contact stress was varied from 588 MPa to 1176 MPa and the tangential force was varied from 3.92 N to 205.8 N.<BR>The structural change of the rolling contact fatigue surface was examined by X-ray diffraction, and the microhardness and microstructure at the rolling contact surface were also measured.<BR>From the experiment, the following results are obtained.<BR>(1) The tangential force acting on the contact surface reduces the rolling contact fatigue life.<BR>(2) Effective strain and microhardness at the contact surface increase a little with the increase of the number of revolutions, and when these exceed certain values, surface cracks are observed at the surface.<BR>(3) The cracks observed consist of main-cracks and branched sub-cracks, and these play as a whole major roles in producing pitting phenomena.

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